Woodworking cutter
5 4月 2018 | 没有评论 | posted by admin | in Article
Rotary tool with one or more teeth. Through the relative movement of the workpiece and the milling cutter, the cutter teeth intermittently cut off the remaining amount of the workpiece. Woodworking milling cutters are divided into two types with hole-set milling cutters and shank milling cutters. Set milling cutters are available in three types: integral, insert and modular. Milling cutters are widely used in joinery production for machining planes, forming surfaces, boring holes, boring heads, slots and carvings. Compared to milling cutters for cutting metal, woodworking cutters have larger rake angles and relief angles in order to obtain sharp edges and reduce cutting resistance. Another feature is the smaller number of cutting teeth and greater chip space. In addition to tool steel and alloy steel, carbide milling cutters are also widely used in woodworking mills to increase productivity and tool life.
blade
2 4月 2018 | 没有评论 | posted by admin | in Article
Flat knife with cutting edge, used for wood cutting or cutting. The different parameters of the blade mounted on a variety of machine tools, can be processed in different ways, such as slicing, peeling, scraping and shearing. Slicing is used for plane machining, and the blade or workpiece generally makes a linear motion. To cut thin wood under certain conditions (such as reducing the cutting angle), thin wood is a high-quality decorative material. During peeling, the wood rotates around a fixed center and the blade performs a continuous linear motion toward the center, cutting the wood into strips of thin wood (single board) for the production of plywood. Shears are used to cut veneers when producing plywood.
What are the disadvantages of twist drills?
29 3月 2018 | 没有评论 | posted by admin | in Article
(1) The rake angle at each point on the main cutting edge of a standard twist drill has a large difference between inside and outside. The rake angle of the main cutting edge at the outer edge of the drill bit is approximately +30°; near the core, the rake angle is approximately -30°, and the rake angle at the near core is too small, resulting in large chip deformation and large cutting resistance; near the outer edge When the front corner is too large, the strength of the cutting edge is often insufficient when machining hard materials.
(2) Longitudinal edge is too long, and the rake angle of the horizontal edge is very negative, reaching -54° to -60°, which will generate a large axial force.
(3) Compared with other types of cutting tools, the main cutting edge of a standard twist drill is very long, which is not conducive to chipping and chip breaking.
(4) The secondary backlash angle of the secondary cutting edge at the land is zero, resulting in increased friction between the secondary flank and the hole wall, increased cutting temperature, large wear at the outer edge of the drill, and deterioration of the machined surface roughness. .
